Plumbing was installed today. For the most part it looks like they've done a fine job. It's amazing to me that they got so much done in one day.
The concerns I'll be brining up tomorrow are that there's no insulation behind the second bath tub, there isn't a drain pipe for the washer / dryer tub thing, and the master tub seems to be missing it's protective liner.
Update: They'll get the insulation in soon, the plumber is coming back to put in that drain, and if there's any damage to the tub they'll replace it. Awesome.
I should also mention that it rained a fair bit today and, because there are no shingles on the roof yet, the place got a little wet. I hope that's okay (it probably is...).